Jet impact pulverizer



P. ANGER JET IMPACT PULVERIZER Filled July March 2, 1937.

1 IIIIIIIII Patented Mar. 2, 19 37 'PATE'NT OFFICE JET IMPACT PULVERIZERPaul Anger, Kiel, Germany Application July 18, 1934, Serial No. 735,852In Germany August 1, 1933 1 Claim.

This invention relates to the pulverization of coal and similar materialby jet impact, and its object is to obtain an apparatus ,which willoccupy the smallest possible space, so that it can conveniently be used,for instance for feedin coal dust to the furnace of a steam boat orrailway engine where economy of space is essential.

,This object is achieved according to the invention by, building thepulverizer direct into the bunker in which the raw materials are stored,sothat the'bunker will serve as the pulverizing vessel. A jet impactpulverizer of known type is suitably modified for combination with abunker.

Fig. 1 of the accompanying drawing represents a sectional view of apulverizer according to the invention, and

Fig. 2 is a sectional-view of a modified form of the pulverizer.

The pulverizer comprises an upright, funnelshaped bunker having at thebottom a jet nozzle 1 through which an air blast is admitted for blowingmaterials stored in the bunker through a mixing pipe 2 against an impactmember 3.'

According to the invention the latter is covered by a double-conicalhood 6 over which the materials-are fed into the bunker, the hoodforming between it and the bunker wall an annular passage through whichthe materials descend for uniform distribution about the mixing tube 2and the jet nozzle. On a level with the impact member the feed passageis of substantially uniform cross-section, the lower hood portion beingsubstantially parallel to the adjacent bunker wall. Above the level ofthe. impact member the feed passage expands in upward direction towardsthe actual bunker space. This arrangement will ensure a regular anduninterrupted feed of material to the nozzle. The materials are brokenup and scattered by the impact member, and the mixture of air andcomminuted materials is deflected by tangentially disposed vanes l andset in a whirling motion. The coarser materials drop back into thebunker for renewed treatment, and the dust-laden air rises through thehood and is discharged through a pipe I which leads through the bunkerspace and passes out through the funnel wall. A conical screen 5 isprovided which, when the air jet is interrupted and the mixing tube 2lowered, preivests the materials from falling through the In thearrangement shown in Fig. 1 the walls In of the upper portion of thebunker converge towards a neck 9 through which the materials are fedinto the bunker from a hopper 8.

Fig. 2 shows a bunker of different shape provided with a pipe. Thisarrangement is particu- When moist materials are being treated by meansof a hot air blast, it is of importance for an effective drying of theraw materials to provide for a ready escape of vapours. For this purposethe lower, funnel-shaped portion of the hood 6' in Fig. 2 is louvred, sothatwhile the raw materials are prevented from entering the hood, thevapours can enter the same through the louvres and escape together withthe coal dust. In the arrangement shown in Fig. 2, the louvred hoodportion is built up from spaced and staggered, coaxial rings I! ofdifferent. diameters. It is evident that coarse particles thrown by thewhirling air current against the sides of the hood, will be able to dropthrough the spaces between the rings and mix with the wet materials inthe feeding passage. As these particles are heated by the air, heatexchange will takeplace, and the drying of the raw materials will thusbe promoted. There will also be heat exchange between the pipe I and thestored material, for drying the latter.

The discharge pipes l3 and I4 and the louvred hood may also be employedin the form of the device shown in Fig. 1', and other modifications maybe resorted to within the scope of the invention as defined by theappended claim.

I claim:

The combination of a funnel-shaped coal or like bunker, a nozzle forblowing a gaseous fluid into said bunker through the lower end thereof.an impact member arranged above the nozzle in the path of the fluid andof the material carried away with it, a double conical hood consistingof an upper portion and a lower portion arranged to cover said impactmember and to receive the fluid and the resulting dust, said bunker andhood being designed and constructed to form between them an annular feedpassage which is of substantially uniform cross-section on a level withthe impact member and which expands in upward direction above saidlevel, and a pipe leading from the top of the hood through the bunkerspace to the outside for discharging from the bunker the fluid and thedust, said lower portion of the hood PAUL ANGER.

